Abyss, this is not an attempt to bash DefTech (they have some impressive subs for their size/price), but be advised that DefTech makes rather lofty claims about their subs' extension with very little data behind their claims. For example, DefTech states that their SuperCube Reference extends down to 11Hz (although at what SPL I've never been able to find in any of their literature) yet when I auditioned that sub, the output was awfully wimpy at even 16Hz.